#include <stdio.h>
int Sum(int s, int e)
{
   int result = 0;
   for(int i = s; i <= e; i++)
   {
     result += i;
   }
   return result;
}
int main()
{
   int start = 1;
   int end = 100;
   printf("I will begin\n");
   int n = Sum(start, end);
   printf("running done, result is: [%d-%d]=%d\n", start, end, n);
   return 0;
}

